I've searched...I've come up empty. 1996 GMC Suburban 1/2 ton 4x4 350 I switched from 2 to 4 hi and 4 hi just blinks. I can hear the actuator (?) click but that's it. Just blinks. Pretty sure 4x4 is not engaging. 2 Is fine. 4 lo wont engage either. Luckily and hopefully we are nearing the end of the winter weather but I'm sure there will be at least one more good one.. So I'm wondering were the best place to start is? From what I have read its not uncommon, just trying to narrow things down. Any help would be great.